Do be careful using one of those in your basement. The ball comes out with a fair bit of velocity; would give a good bruise, but will also dent appliances and break your beer glass. I get the valve stems from regular tire valves, or bicycle tube valves. I have made a few with different threads to fit Euro stuff. I also have a CO2 discharger. My flinters all have liners with the standard 1/4x28 threads, so these adapters will just screw in, or I can put a nipple in and use the CO2. Fortunately, I have seldom had to use these for myself, but have certainly used them for others; usually after they have broken or tried every puller they could find